Definition of Herculean in English:

Herculean

Syllabification: Her·cu·le·an
Pronunciation: /ˌhərkyəˈlēən, hərˈkyo͞olēən
 
/

adjective

Origin

late 16th century (in the sense 'relating to Hercules'): from Latin Herculeus 'Hercules' + -an.

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody